if you see EmployeeName sam has not submitted his timesheet for 2013-05-17 that is in between 10-22 May, I am trying to get that info, search those employees who have not submitted there timesheet for a given week.

I update the employeedb table with last submittion date as in above latest timesheet submittion date is 2013-05-22 so everytime when a employee submits this date gets changed in lastweek field to latest one.